New battery, old problem: HOT terminal-busbar connections. Here is what happened! 1/2

I wanted to do a simple test tonight: pulling some loads with the new battery and taking a video with the FLIR camera to check if everything is OK. Well, it is not OK because it looks like we have candles inside the cells and all the terminals are glowing up!
So, here is the thing: the battery cells are brand new, the bus bars are brand new, the BMS is brand new. But, here we are seeing an old problem which I always had with the 1st battery. Hot terminals and hot bus bars!
I'm investigating, testing other busbars and trying to find out what is going on. It's confusing as some of the terminals stay cool while others heat up a lot.
Follow me on the journey to find the problem.

The Digital Mermaid's video:
What's Better? Rigid or Flexible Bus Bars - How to build a 48v Lifepo4 battery
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Testing Paul's aluminium busbars:
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